/**
 * Project Name:jiuselu-parent
 * File Name:FileUploadUtils.java
 * Package Name:com.fxp.project.jiuselu.commons.file
 * Date:2021年11月10日 15:41
 * Copyright (c) 2021, Kai.Wang All Rights Reserved.
 */
package com.fxp.project.jiuselu.commons.file;

import com.fxp.project.jiuselu.commons.exceptions.JiuLuException;
import com.fxp.project.jiuselu.commons.utils.CommonUtil;
import com.fxp.project.jiuselu.commons.uuid.IdUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

/**
 * ClassName:FileUploadUtils<br/>
 * Function: 文件上传工具类<br/>
 * Date:2021年11月10日 15:41<br/>
 *
 * @author Kai.Wang
 * @version 1.0.0
 * @see
 * @since JDK 8
 */
public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String profile, String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(profile, baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir          相对应用的基目录
     * @param file             上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws IOException                    比如读写文件出错时
     */
    public static final String upload(String profile, String baseDir, MultipartFile file, String[] allowedExtension) throws IOException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new JiuLuException(102000, FileUploadUtils.DEFAULT_FILE_NAME_LENGTH + "");
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(profile, baseDir, fileName);
        return pathFileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension) {
        long size = file.getSize();
        if (size > DEFAULT_MAX_SIZE) {
            throw new JiuLuException(102000, (DEFAULT_MAX_SIZE / 1024 / 1024) + "");
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new JiuLuException(102000, fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new JiuLuException(102000, fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new JiuLuException(102000, fileName);
            } else if (allowedExtension == MimeTypeUtils.VIDEO_EXTENSION) {
                throw new JiuLuException(102000, fileName);
            } else {
                throw new JiuLuException(102000, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = CommonUtil.getCurrentDate() + "/" + IdUtils.fastUUID() + "." + extension;
        return fileName;
    }

    public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.exists()) {
            if (!desc.getParentFile().exists()) {
                desc.getParentFile().mkdirs();
            }
        }
        return desc;
    }

    public static final String getPathFileName(String profile, String uploadDir, String fileName) throws IOException {
        int dirLastIndex = profile.length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = "/" + currentDir + "/" + fileName;
        return pathFileName;
    }
}